SURFACE TEXTURES FOR EARTH BORING BITS - Patent 2038507

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EP 2 038 507 A1

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(43)	Date of publication:
	25.03.2009 Bulletin 2009/13

(21)	Application number: 07796007.8

(22)	Date of filing: 11.06.2007

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International Patent Classification (IPC):

E21B 10/22^(2006.01)

F16C 33/32^(2006.01)

(86)	International application number:
	PCT/US2007/013760

(87)	International publication number:
	WO 2007/146276 (21.12.2007 Gazette 2007/51)

(84)	Designated Contracting States:
	AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC MT NL PL PT RO SE SI SK TR
	Designated Extension States:
	AL BA HR MK RS

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Priority:

09.06.2006 US 812539 P
11.06.2007 US 760892

(71)	Applicant: BAKER HUGHES INCORPORATED
	Houston TX 77210-4740 (US)

(72)	Inventor:
	LIN, Chih, C. Spring, TX 77386 (US)

(74)	Representative: Sloboshanin, Sergej et al
	V. Füner, Ebbinghaus, Finck, Hano Mariahilfplatz 3 81541 München 81541 München (DE)

(54)	SURFACE TEXTURES FOR EARTH BORING BITS